Telephone-repeater.



M. R. GILSON. TELEPHONE REPEATER:

APPLICATION FILED AUG. 8, 1907.

Patented Aug. 10, 1909.

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M. R. GILSON.

- TELEPHONE REPEATER.

APPLICATION FILED AUG. 8, 1907.

930,854. Patented Aug. 10, 1909.

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Epecification oi Letters Patent.

Aug. 10, 1905*.

:'i fication filed August 8, 1997. Sea-119.13%. 33*],713.

To all whom it may concern: I

Be it lniown that l, MARK R. GILsoN, a citizen of the United States, residing at Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new and useful Improvements in flelephoneltepeaters, or" which the followmg is a specification,

This invention relates to telephone repeaters, and has for its object to provide a device of this character which can be placed between telephone lines to take up the can rent before it reaches its destinhtion and strengthen or magnify it, and then permit the telephone current to travel farther than it would in ordinary use of telephones in which repeaters are not employed.

Another objectof this invention resides in the construction of commutator so that the tone set up would be beyond the range of the ear.

Gther objects and advantages will be ap parent from the following description and it will be understood that changes in the specific structure shown and describedinay be made within the scope of the claims without departing from the spirit of the invention,

In the drawings forming a portion of this specification, and in which like characters of reference indicate similar parts in the several views, Figure l is a diagrammatic view showing my repeater installed between two telephones, Fig. 2 is aside elevation of the repeater, Fig. 3 is a plan View, Fig. 4% is a section on the line 4e4 of Fig. 3, Fig. 5 is a detail view or a modified form of commutater.

Referring now more particularly to the drawings, there is shown a. telephone repeater l comprising pole members 7 and 9- i'espectively which are-connected by a vertically disposed iron field bar 8 which is provided with a field magnet coil 5 as shown, and which will be called hereinafter an exterior magnet. Tlhe pole member '4 at one side, is provided with a vertical standard 12, and disposed at the other side of this pole memher, there is shown a standard 13. The standards 12 and 13 support a stationary a; it-ure shaft 15 which is preferably hollow as shown. Qhe shaft 15 supports revolubly a drum wound armature 16; which consists of thespaced disks 17 and its armature windn" 18 all of which being arranged to revo ve between the pole members '2' and tirespectively. An arm 19 is supported upon the shaft 15 and is disposed between the disks 1? and within the winding 18. The

arm 19 is provided with opposite segmental,

heads concentrically spaced from the poles 7 and 9, and carries a coil 20 which thus produces an interior field magnet to be hereinafter more fully referred to. The armature 16 carries a commutator 23 provided with the usual segments 24, and at one side, the commutator is provided with a suitable pulley 23" by means of which the armature may be driven by a suitable motor, not shown. An arm 25 is supportedupon the shaft 15 adjacent. to the standard 13, and this arm carries brackets 26 and 27 respectively which are provided with brushes 28 and 29. Line wires A and B are connected with the brushes, as shown.

A permanent magnet 21 is secured by a strap 22 to a base block 14; which supports the described parts, the purpose of which being to neutralize and destroy residual magnetism in the field magnets by induction. It has been'tound that this residual magnetism if not destroyed causes a flow of direct current from the armature magnet, which would result in a tone as the brushes pass from one segment to another.

It has been found that the rapid articulation of the current caused by the commutator does not cause a perceptible tone in the currentinduced by the potential vibration of the telephonic current, as the current communicated to the brushes by the commutator is in direct ratio to the magnetic impulses induced in the field by the telephonic current. But the residual magnetism of the field, if not destroyed, creates an independent tone of constant pitch, perwpt-ible separately from the telephonic vibrations. This be explained as follows: The tone prcluced by a segmental commutator is not due simply to the fact that the current is interrupted but to the slight fluctuation of current caused by a change in the potential eta segment between the time of contact with the brush and its passage out of contact therewith,

caused by the difierence in the direction of movement of the relative coil of the armature with respect to the; lines of force in the magnetic field. It will thus be seen that a la'r increase of segments in the commutater illowsless variance in potential betweegi the mailing and breaking of the contact between a single segmentand the brush. But even when the number of 'segments is comparatively small, where the exciting current is Varying it will be obvious that the tone will vary correspondingly, and consequently .is not then a tone, but a constantly changing succession of vibrations tending to supplement the vibrations of the exciting current. The tone produced when the magnetic field is due to residual magnetism, is constant, beir at times higher than the excited vibrations and at other times lower, and interferes with the efiectiveness of the telephone current. It will thus be apparent" that the elimination of the residual magnetism in thefield eliminates the apprecl able tone in the .telephonic current when i magnified by the present device.

By using the modified form of commute-o tor shown in Fig. '5 1am enabled to omit the magnet 21. --I-"here employ a greater number of commutator segments, and rotate the armature, at a greater speed so that tone set up would be sowhigh in. pitch as to be beyond the range of the ear. It will thus.

' be seen that by having the three windings,

2'. e., the interior field magnet, the armature, and exterior field magnet in series, any current pulsation from an outside source sent through the field-j magnets will set up a magnetic field in the armature and will cause lines of force to be out in the armature, which current generated in the armature will fiow with that current pulsation from the outside source and thereby in crease orboost it.

In the diagram, shown in Fig. 1, there are shown two instruments C and D, and these instruments are provided-with. batteries E and F respectively and the'usual transmitters and induction coils. Gonnecting the instruments 0 and D are line wiresfi and H. It will thus be seen that when the instrument Cis in use, the alternating telephone current will travel along the wire G, andjthe telephone current willhe'delivered to the wire A, whereupon/the current'will be ta on to the armature 16, by means of 'nmutatonfaiid its brush 28, and thence from. the commutator, the current will be delivered-to the brush 29, and from the brush 29 to the field magnet 6, and from this magnet to the field winding .20 upon the arm 19 within the armature l6, The wire B, is shown as the other pole for the field magnet 19 and completing its circuit through the line wire H, to the instrument and returning again to O. From the construction shown, it will be seen, that after the current has been received by the respecse ate enter the wires of the respective i'nstruvinents'.

l V i I By reason of the fact there is no moving 11011 in the armature 16,hysteres1s or lagging is prevented, which would otherwise distort the telephone currents.

What-1s claimed is:

1. In a telephone repeater, the. combination with interior and exterior field magnets, and a hollow armature revolving between the two, of means for destroying residual magnetism in the field magnets.

'2. A telephone repeater, comprising interior and exterior field magnets, an"arma-' ture revolvingnetween said magnets, and a magnet for destroying residualmagnetism in'the field magnets;

3. A telephctuev repeater comprising interior andextsrior field magnets, an armature revolving between said magnets and including a commutator and brushes,- said brushes being in circuit with said exterior field magnet, the armature being in circuit with the brushes'and with the inside field magnet, and 'a" pe'rmanent magnet-for destroying 'residuah'magnetism in the field magnets. i

4. Atel'ephone repeater comprising a stationary field magnet, a-hollow drum wound armature; a'f stationary-field ma net located Within the hollow armature, an means for destroying residual magnetism in. thefield magnets. l

A telephonerre peatei" comprising interior and exterior field magnets, a hollow armature revolving between the/field magnets, a collector carried by the armature, and magnet means for destroying residual magnetism in the field magnets.

6. A- telephone repeater comprising a stationary fieldmagnet, a hollow armature, a collector carried by the armature, a stationary field magnet located within the hollow armature, and means for neutralizing residual magnetism in the field magnets.

7. In an instrument of the class described the combination with interior and exterior field magnets, ai'evolving armature located between said magnets and in series therewith, and commutator, of means for destroying-by induction the tone est-a lished by the commutator brushes.

In testimony whereof I afiix my signature, in presence of two witnesses.

MARK R. GILSON. Witnesses? ELMER Gour'r, HARLES l d. SMITH. 

